This exercise requires the use of a computer package. The article “Vital Dimensions in Volume Perception: Can the Eye Fool the Stomach?” (Journal of Marketing Research [1999]: 313–326) gave the data below on dimensions of 27 representative food products.
a. Fit a multiple regression model for predicting the volume (in ml) of a package based on its minimum width, maximum width, and elongation score.
b. Why should we consider adjusted R2 instead of R2 when attempting to determine the quality of fit of the data to our model?
c. Perform a model utility test.

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